Bench tool

Tube Substitution / Cross-Reference Tool

Look up a tube and see which substitutes are safe drop-ins, which need a rebias, and which change heater current, socket, or don't belong in that circuit at all.

⚠ This reflects commonly published tube manual specs, but manufacturers vary and amps get modified. Always confirm plate dissipation, heater current, and bias range against the datasheet for the exact tube in hand and re-check bias after any power tube swap.